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A R. G. VASSAR.

ALARM LOCK.

N0.298,136. Patented May 6, 18784.

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ROBERT G. VASSAR, OF NEV YORK, N. Y.

ALARM-LOCK.

SPECIFICATION forming part of Letters Patent No. 298,136, dated May 6,1884.

Application filed May 18, 1883. (Model.)

.To a/ZZ 1,071,071?, it may concern:

Be it known that I, Ronin. G. VassAR, a citizen of the United States,and a resident of New York, in the county of New York and State of NewYork, have invented certain new and useful Improvements in Door-Bolts,of which the following is a specification.

My invention relates to door-bolts; and its object is to so constructthe same that when the bolt is shot it cannot be operated so as tounlock the door by the means of any tools or instruments inserted fromthe outside.

To this end my invention consists inA the combination,with a door-bolt,of a spring which tends to throw the bolt back when it is-shot to lockthe door, anoperating thumb-piece or slide detached from the bolt, andso arranged that it may be brought against the bolt `for throwing it tolock the door, and a suitable automatic sliding catch, which engageswith the bolt automatically to hold it when it is shot, but which may beoperated from the inside of the doorto release the bolt and allow it tobe thrown back by the action of the spring.

My invention consists, further, in certain specific combinations anddetails of construction, that will be specied in the claims heretoannexed.

My invention is designed more particularly for use with the automaticalarm described in a prior application iiled by me, in which applicationI have described the bolt and alarm as so combined that the latter willbe released and sounded upon the movementof the bolt sidewise,consequent upon the impingement of a tool upon it, or of pressure uponthe door, upon an attempt to open it by any unauthorized person.

In the accompanying drawings, Figure 1 is a front view of thebolt-casing. Fig. 2 shows the top plate of the casing removed to exposethe interior mechanism. Fig. 3 is a longitudinal cross-section on theline 3 3 of Fig. 2.

A indicates the casing of the bolt, and A2 the plate upon which the boltand its attached `parts are mounted, both plate and casingbethe ,insideof a door. C indicates the bolt proper, which works through aguide-piece, C, and is provided with a coiled'spring, C3,

abutting at one end against a collar, (3*, on the bolt, and at t-heother against guide C2, so that raised surface on plate A2, assists inguiding- D3 indicates a retractingspring that serves to return the slideD to its normal position. Formed in plate I is a slot pr recess, I2,with which an automatic sliding catch-bar, E3, engages when the bolt isshot.. The barll.3 works in a guide-slot formed in a 'raised portion ofVthe base-plate A, and is provided at its upper end with a pin orprojection, j, with which engages a spring, J, that tends to lift thecatch or slide bar E3. A step or rabbetis formed on E, at e, to engagein slot I2. E indicates a small knob,working in a slot in the casing,and

`having a rounded or beveled head upon the outside of casing A,`and alsoprovided witha spindle or stem, E2, that passes into a slot in E, sothat -Eamay be drawn down against the action of the spring J. Vhen thebolt is shot by theslide D, the catch-bar FP engages autoL maticallywith the slot I2, and locks the bolt 'from backward movement under theaction of y When it is desired the compressed spring G3. to unlock thedoor, the button E is moved downward, thus releasing the bolt when thespring C will throw it back. rIhe button E,

havinga rounded surface, cannot be operated by a wire or otherinstrument inserted from the outside of the door, nor can that bolt besubjected to any retracting force through slide D, since the same v onlyengages with the bolt in such a way as to enable the bolt to be shot tolock the door.

I have lherein shown the bolt as combined with an automatic alarm thatwill be set oft in case the bolt be moved laterally against the force ofa spring, K, secured to the bolt, and resting against the inner surfaceof the plate A. The alarm mechanism does not differ materially from thatdescribed in a prior application for patent liled by me. The essentialparts thereof are as follows:

II is a spring detent-arm upon the arbor of the mainspring-wheel G,and Ois acatch-plate having a step or catch at h., with which the spring-armengages and is locked when the alarm is wound up.

F is a handle or arm upon the outside of the casing, which is secured tothe saine spindle as H,and serves to wind up the alarm mechanism. Aplate, M, pivoted to plate O,allows the detent-arm II to pass in the actof winding up the mechanism, but when the mechanism is wound up willalso permit the arm to springinto engagement with the step h. rIhe plateM has a curved edge, as indicated, and a spring, S, which Vlends tothrow said plate against the stop N, and into position where,when thedeteut is re leased and begins its retrograde movement, said detent willslide over such curved edge, and will pass the step h without engagingwith the same. The bolt C, or the rearmost portion, I, is capable of aslight lateral movement, and when the boltis shot a raised portion,L,ol" the plate I is in position to engage with the springarm H andrelease the alarm mechanism in ease any lateral movement should be givento the rear portion of the bolt, either by the insertion of adrilling-tool or other instrument by any unauthorized party, or by anattempt to open the door when it is bolted.

G is the escapement-wheel ofthe alarm mechanism,which serves to impartmovement to the bell-hammer Bt in the ordinary way, while B indicatesthe bell, mounted on plate A2 in position coincident with an opening cutin the top plate, A, so as to allow the sound tomore readily escape.

G Gz indicate the well-known device of a Geneva stop to preventoverwinding of the driving-spring for the alarm mechanism.

I do not limit myself to any particular construction ot' catch or lockfor automatically engaging with the b olt when it is thrown to lock thedoor, as many others may be used in place of that shown foraccomplishing the same purpose-viz., the automatic detaining of the bolti after it is 'thrown to prevent it from being thrown back by the actionof the spring or rotractor until the catch is removed from engagementwith the bolt by the slide button or knob E, or other means within thecontrol only of some authorized person. It would be within my inventionto attach the slide D D2 to the bolt or an extension, j; butIgenerallyprefer not to do this, as it would afford a means whereby the bolt mightbe subjected to a strain by a tool inserted through the door for thepurpose of unlocking it.

I am aware that a bolt having a spring which tends to throw it back anda catch for releasing the bolt, so that it can be retracted by theaction of the spring, is not broadly new.

vVhat I claim as my invention isl. rIlhe combination, with the slidingbolt C and its retracting-spring,ofthe automatic sliding` catch forholding the bolt, and the rounded head or button E for the catch,projecting through the casing and nearly ilush with the outer surfaceol' the casing, as and i'orthe purpose described.

2. rIlhe combination,with the bolt and its retractor,ofa detachedoperating-slide or th u mbpiece arranged to engage with the bolt tothrow it against the stress of its retractor, but not capable ofcatchingupon it inthe opposite direction, and an automatic catch for engagingwith and holding the bolt against its spring, as and for the purposedescribed.

3. The combination ol' bolt C, spring C, sliding catch E, spring J, androunded button E,

having siem or spindle Eicngaging with slide ROBERT G. VASSAR.

Witnesses:

Trios. TooMEY, WM. H. BLAIN.

